Showing papers by "Universidade Federal de Minas Gerais published in 1971"

Electron Microscopy of Developing Sympathetic Fibres in the Rat Pineal Body The Formation of Granular Vesicles

Abstract: Publisher Summary The development of the sympathetic innervation of the rat pineal body was studied at the ultrastructural level. Special attention was paid to the granular vesicles, in the hope of obtaining some further insight into their mechanism of formation. There is now considerable evidence that vesicles play an important role in the synthesis, uptake, storage, and release of catecholamines. Small granular vesicles (SGV) could be observed in small amounts, a few hours after birth. Their number increased enormously during the first two weeks, while the number of the large granular vesicles remained within the range observed in the adult from the day of birth. There was also an increase in the proportion of small granular to granular vesicles, as well as in the size of their granules. This fact was taken as evidence that SGV were forming from agranular vesicles (AV) with the appearance at the vesicle membrane of a small granule that progressively increased in size. Some of the large granular vesicles (LGV) appeared to be formed by a similar mechanism. However, most of the LGV originate by pinching off from sacs and tubules of smooth endoplasmic reticulum that had accumulated dense material. In developing adrenergic fibres, a part of the LGV—the granules—and probably the membranes of the SGV are formed locally in peripheral axons and nerve terminals.

Antimalarial activity of natural, racemic and unnatural dihydroquinine, dihydroquinidine and their various racemic analogs in mice infected with Plasmodium berghei.

Abstract: Racemisches Dihydrochinin und die beiden optischen Antipoden zeigen die gleiche Aktivitat gegenPlasmodium berghei wie Chinin. Hingegen waren die entsprechenden Dihydrochinidine sowie die 6′-Desmethoxy-7′-chlor-Analogen von Dihydrochinin und Dihydrochinidin etwa viermal wirksamer.

Social Aspects of Transference and Countertransference in the Patient- Psychiatrist Relationship in an Underdeveloped Country: Brazil

Abstract: The patient-psychiatrist relationship has been extensively analysed at its psychological level. It has become increasingly clear that the most prescribed medicine is the doctor himself, in the famous words of Balint. We have already analysed the intersubjective level of the patient-doctor interation, and the conflicts between the aspects of the personalities of both of them, which bring out therapeutic relationships predominantly positive or negative. The &dquo;placebo effect&dquo; can be now understood through the psycho-social and inter-subjective occurrence of the therapeutic relationship, as revealed by the instruments of psychoanalysis and psychiatry. We must keep in mind, however, that psychiatrist and patient are social beings, and that their encounter is an occurrence which realizes at that level the social structures. This is an aspect which has been overlooked in psychiatric and psychoanalytic texts dealing with the patientdoctor relationship.

Alterações do pericárdio na fase crônica da tripanossomíase cruzi humana e nas fases aguda e crônica da moléstia experimental

Abstract: Os Autores estudam as alteracoes do pericardio, especialmente do pericardio visceral na cardiopatia chagasica, confrontando-se com as alteracoes, observadas em outras cardiopatias (reumaticas e hipertensivas). Analisam as alteracoes pericardicas no camundongo experimentalmente infectado e discutem especialmente a natureza e a genese das lesoes, a evolucao e a correlacao dos varios aspectos morfologicos entre si.

DNA e volume nuclear em Enteropneusta, Tunicata cephalochordata e suas implicações filogenéticas

Abstract: Foi estudado o teor em DNA per nucleo e o volume nuclear em espermatocitos de Salpa democratica, Balanoglossus gigas e Branchiostoma caribbaeum. Os valores de DNA encontrados expressos em picogramas colocam estas especies al limite inferior da variacao do DNA em vertebrados. Embora o Balanoglossus esteja em uma posicao filogenetica inferior a dos Tunicados, o teor de DNA desta especie e maior do das salpas. O tamanho relevante desta especie poderia fazer supor uma situacao multipla do genoma, faltando, porem, totalmente indicacoes citogeneticas. A variacao do valor da relacao entre DNA e volume nuclear entre as especies estudadas sugere uma possivel significacao taxonomica deste carater quantitativo.